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From: jesup@cbmvax.commodore.com (Randell Jesup)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Hardrives and the A3000
Message-ID: <20351@cbmvax.commodore.com>
Date: 4 Apr 91 02:53:24 GMT
References: <20023@cbmvax.commodore.com> <4216.tnews@tower.actrix.gen.nz> <20249@cbmvax.commodore.com> <1991Apr3.165303.27006@uokmax.ecn.uoknor.edu>
Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
Organization: Commodore, West Chester, PA
Lines: 32

In article <1991Apr3.165303.27006@uokmax.ecn.uoknor.edu> rrmorris@uokmax.ecn.uoknor.edu (Rodney Raym Morrison) writes:
>
>  Thanks for the help, Mr. Jesup. A got my 1.3 partition up and running now.
>
>  You just said your were getting 1.5 - 2.0 MEG/S transfer on your swift
>drive. I've also got a swift, but only get 500 KB/S trnsfer at the fastest.
>(I have the 124 MB drive though,  ST1124N.
>  What settings should I use to get closer to your performance?

	I can easily believe the small drive would provide less performance.
I posted an article giving a whole series of things that can affect
measurement of disk speed.  I measured mine by just starting it, but I tend
to keep my drives set up in a high-performance manner, and I also have a
3000T with 8Mb scram fast memory.  Running out of fastmem while measuring 
will KILL your numbers.  I got the fastest numbers by making sure the cylinder
size matched that of the drive for the first partition, by measuring only the
first "notch" of the drive, making sure all background things are stopped,
no excessive overscan, etc.  The same drive on a 2500/030 with 2091 gets
1.7M/s on his setup.  I regularily get 1.9 without playing around.

	I would expect a bit faster than you say (600-1M/s), and more if it's
a 4400 rpm drive like the 1480N (say 1-1.5M/s).  Looking at my manual, the
smallest drive in the same series as mine is ~330Meg, so I suspect yours isn't
one of the super-fast ones.

-- 
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com  BIX: rjesup  
Disclaimer: Nothing I say is anything other than my personal opinion.
Thus spake the Master Ninjei: "To program a million-line operating system
is easy, to change a man's temperament is more difficult."
(From "The Zen of Programming")  ;-)